Title: Commodity Chemicals from Biomass: Catalytic Conversion of Biomass into α,ω-diols
Speaker: Prof. George W. Huber(University of Wisconsin-Madison)
Venue: Room 306, Shool of Light Industry and Engineering, Building D, Wushan Campus
Time: OCT. 19, Friday, 15:00-16:00
This presentation is about a multi-step catalytic approach for conversion of cellulose into 1,6-hexanediol and hemicellulose into 1,5 pentanediol as well as other oxygenated commodity chemicals. These α,ω-diols are high-volume (130,000 tons/year), high value ($4,600/ton) commodity chemicals used in the polymer industry. Cellulose is first converted levoglucosan which is then dehydrated into levoglucosenone (LGO) in the condensed phase with dilute acid (5-20 mM acid concentration) using a polar, aprotic solvent. The product selectivity and catalyst activity is a function of the water concentration, the solvent type and the cellulose loading. The activity of the acid catalyst is a function of the thermodynamics of the solvent system as will be presented using a molecular dynamics model. The LGO is then hydrogenated into dihydrolevoglucosenone, levoglucosanol, and tetrahydropyran-2-methanol (THPM). The THPM then undergoes selective C-O-C hydrogenolysis to produce 1,6-hexanediol using a bifunctional (Pt-WOx/TiO2) catalyst with > 90% selectivity to 1,6 hexanediol. Tetrol and 1,2,6 hexanetriol can also be selectively produced with this system. The functionality of these molecules can be exploited to produce a range of high performance material. The hemicellulose is converted into furfural which then undergoes a four step process to produce 1,5 pentanediol. In the first step furfural is hydrogenated into tetrahydrofurfuryl alcohol (THFA). The THFA is then dehydrated into dihydropyran (DHP) and water. The last two steps involves hydration of the DHP and then hydrogenation of this hydrated species. We will outline the catalytic chemistry that happens in each of these steps and the catalytic challenges for production of new biomass based commodity chemicals.
Announced by School of Matreials Science and Engineering